A zener diode with 5 V zener voltage is used to regulate an unregulated dc voltage input of 25 V. For a 400Ω resistor connected in series, the zener current is found to be 4 times load current. The lo

Question

A zener diode with 5 V zener voltage is used to regulate an unregulated dc voltage input of 25 V. For a 400Ω resistor connected in series, the zener current is found to be 4 times load current. The load current ( I L ​ ) and load resistance ( R L ​ ) are :

TestHub · Accepted Answer

From the circuit diagram, ​ 5 i = 400 20 ​ = 20 1 ​ A ∴ i = 100 1 ​ A = 10 mA = Load current ​ Also, V L ​ = 5 V ∴ R L ​ = 10 × 1 0 − 3 5 ​ Ω = 500Ω

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